Anesthesia system with CO.sub.2 monitor to suppress CO.sub.2 breakthrough
US5673688A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1996 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Sep 26, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2230/432
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system is provided for detecting the breakthrough of CO.sub.2 into the inspiratory limb of a substantially closed circle patient breathing circuit having a CO.sub.2 absorber to remove CO.sub.2 from the continuously recirculating gases. The CO.sub.2 is detected by a gas analyzer located in the inspiratory limb of the patient breathing circuit. Upon detection of that CO.sub.2, the system increases the flow of fresh gas into the circle patient breathing circuit to a flow rate in excess of the minute volume of gas being delivered at that time to the patient. The increased flow of fresh gas basically prevents the further flow of CO.sub.2 from the expiratory limb into the inspiratory limb, thus preventing the CO.sub.2 from being inhaled by the patient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.